HPAK SYSTEM COMPONENTS OVERVIEW
1.6.3. Operation of Combo Valves
The combo valves are integrated check and ball valves, with temperature gauges. Cracking pressure (minimum fluid flow pressure)
of the check valves is 0.30 psi. The valves can be operated by turning the plastic handles clockwise, with note taken of the position
of the slots on the handles, indicating valve position as pictured in figures 1.6.3.-1 – 3 below. To ensure proper compression fitting
seals, clean and round copper tubing must be used. Use a counter wrench on the hex provided to fully torque compression nut
fittings. Bush up or down as necessary for proper flow rates.
1.6.1. Tempering Valve
Install a tempering valve to prevent scalding; the solar storage may reach 180°F. Some areas may require a rated Anti-Scald
valve.
For dual tank systems with a gas backup, install the tempering valve before the gas water heater and after installing the solar
storage tank, to avoid a service call for high limit fuse replacement. For dual tank systems with an electric tank, the tempering
valve may be installed before or after the tank. For instantaneous water heaters as backup, consult the manufacturer for the
recommended method of tempering or bypass of solar heated water into the heater.
1.6.2. System Overheat Protection and Operation of Pressure Relief Valve and Expansion Tank
The HPAK comes with a preinstalled pressure only relief valve, nonadjustable and pre-set at 150 psig. A 1/4“ barbed hose fitting is
supplied for routing relief fluid to a drain or retaining vessel.
In addition, the system comes with a pre-sized bladder type expansion tank. The acceptance volume of the expansion tank
should be large enough to store up to 17 – 20% of the total collector system fluid volume.
With these safety precautions, and high temperature Dyn-O-Flo HD propylene glycol, the system can stagnate for short periods.
If extended periods (2 weeks or more) are expected, install a Delta-T Pro with the proper vacation setting. Additionally, the
system should never have less than 1.5 gallons of storage for each square foot of collector surface area.
1.6.4. Operation of Filling Valve
The filling valve integrates three gate valves into one.
The green handles operate the inlet and outlet of the
valve, while the drain fitting on the side enables either
filling or system operation. Always fill the system in the
direction of the flow path.
If not using a Heliodyne filling station, hose adapters
are set into the HPAK foam to the right of the fill
valve.
16
14
15
61
7
17
Figure 1.6.4.-1: Drain Fitting Open
(Operation Position)
Figure 1.6.4.-2: Drain Fitting Closed
(Fluid Servicing)
Figure 1.6.3.-1: Ball Valves Open
(Operation Position)
Figure 1.6.3.-2: Check Valves Open
(Fluid Servicing)
Figure 1.6.3.-3: Ball Valves Closed
(HPAK Servicing)
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